Laboratory ventilation device

Abstract

The utility model discloses a laboratory ventilation device, which relates to the field of ventilation cabinets and comprises a ventilation cabinet, an exhaust pipe is mounted at the top end of the ventilation cabinet, a glass protective door is vertically connected to the inner side of the ventilation cabinet in a sliding manner, a tray and a transmission mechanism are axially mounted in the ventilation cabinet in a sliding manner, and the transmission mechanism is arranged on the glass protective door and the ventilation cabinet. The limiting unit is used for providing supporting and limiting for installation of the exhaust pipe. By arranging the transmission mechanism, the glass protective door moves upwards, meanwhile, thrust is transmitted to the U-shaped partition plate through the first gear and the second gear, a notch of the U-shaped partition plate is aligned with the filter screen, harmful gas is filtered through the filter screen, when the glass protective door is closed, the notch of the partition plate and the filter screen are staggered, and the harmful gas is filtered. The filter screen is separated from the inner cavity of the cabinet body, so that when the filter screen is replaced, dust falling due to vibration generated by replacement of the filter screen can be received by the U-shaped partition plate, pollution to the inner cavity of the ventilation cabinet is avoided, and cleanliness of the inner cavity of the ventilation cabinet is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of ventilation cabinets, specifically a laboratory ventilation device. Background Technology

[0002] Due to certain special requirements, laboratories have relatively high requirements for indoor air quality. During experiments, laboratories often produce some toxic and harmful gases. To protect the safety of researchers and prevent them from inhaling excessive amounts of harmful gases and causing health damage, we need to ventilate the laboratory frequently.

[0003] In the prior art, in order to ensure the safety of users, a fume hood is usually used. Experiments with chemicals containing harmful gases are conducted inside the fume hood. The harmful gases are filtered by filters and activated carbon plates installed inside the fume hood. In order to ensure the filtration efficiency of the filters, the filters need to be replaced regularly. Based on this, in order to ensure that the dust adhering to the filters does not fall and contaminate the inner cavity of the fume hood when the filters are replaced, this utility model proposes a laboratory ventilation device. Utility Model Content

[0004] The purpose of this utility model is to provide a laboratory ventilation device in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a laboratory ventilation and air exchange device, including an air exchange cabinet, an exhaust pipe installed at the top of the air exchange cabinet, a glass protective door vertically slidably connected to the inner side of the air exchange cabinet, a tray axially slidably installed inside the air exchange cabinet, and a transmission mechanism set on the glass protective door and the air exchange cabinet.

[0006] The transmission mechanism includes a filtering unit, a separating unit, and a limiting unit;

[0007] The filtration unit is used to filter harmful gases generated during experiments inside the ventilation cabinet.

[0008] The partition unit is used to separate the exhaust pipe from the inner cavity of the air exchange cabinet;

[0009] The limiting unit is used to provide support and limit for the installation of the exhaust pipe.

[0010] As a further improvement of this utility model: the filtration unit includes a filter screen and a U-shaped partition;

[0011] The filter screen is installed inside the ventilation cabinet and below the exhaust pipe. The filter screen is used to filter harmful gases inside the ventilation cabinet.

[0012] The U-shaped baffle is axially slidably installed on the inner side of the ventilation cabinet, and the U-shaped baffle is used to adjust the use and separation of the filter screen.

[0013] As a further embodiment of this utility model: the separating unit includes a first rack, a first gear, a transmission rod, a second gear, and a second rack;

[0014] The first rack is fixed to the top of the glass safety door, and the first rack is used to provide rotational thrust to the first gear;

[0015] The first gear is rotatably mounted inside the air exchanger, and the first gear is used to synchronously drive one end of the transmission rod to rotate circumferentially;

[0016] The transmission rod is eccentrically rotatably connected to the outer wall of the first gear, and the transmission rod is used to provide rotational thrust to the second gear;

[0017] The second gear is rotatably mounted inside the air exchanger, and the second gear is used to provide axial thrust to the second rack;

[0018] The second rack is fixed to the outer wall of the U-shaped partition, and the second rack is used to synchronously drive the U-shaped partition to move axially.

[0019] As a further embodiment of this utility model: the limiting unit includes a pressing block, a connecting plate, a limiting block, a positioning rod, and a spring;

[0020] The pressing block is vertically slidably installed on the outer wall of the top of the handle of the tray and extends into the interior of the tray. The pressing block is used to synchronously drive the connecting plate to move vertically.

[0021] The connecting plate is fixed to the bottom end of the pressing block and located inside the tray. The connecting plate is used to synchronously drive the limiting block to move.

[0022] The limiting block is fixed to the top outer wall of the connecting plate and extends through the pallet into the interior of the ventilation cabinet. The limiting block is used to limit the axial movement of the pallet.

[0023] The positioning rod is fixed inside the tray and passes through the connecting plate, and the positioning rod is used to guide the vertical movement of the connecting plate;

[0024] The two ends of the spring are respectively engaged inside the tray and at the bottom of the connecting plate, and the spring is used to always provide the connecting plate with an upward compressive force.

[0025] As a further embodiment of this utility model: the two ends of the transmission rod are respectively eccentrically rotatably connected to the outer walls of the first gear and the second gear, and the two ends of the transmission rod are equidistant from the midpoints of the first gear and the second gear.

[0026] As a further improvement of this utility model: the interior of the ventilation cabinet is formed with a sliding groove for the axial movement of the U-shaped partition, the outer wall of the U-shaped partition is in the shape of a "U", and the solid part of the U-shaped partition is matched with the filter screen.

[0027] As a further improvement of this utility model: the end of the exhaust pipe is provided with a fan for discharging harmful gases from inside the ventilation cabinet, and the outer walls of the first rack and the second rack mesh with the outer walls of the first gear and the second gear, respectively.

[0028] As a further improvement of this utility model: the ventilation cabinet is equipped with a cylinder that pushes the glass protective door to move vertically, the output end of the cylinder is fixedly connected to the bottom of the glass protective door, and the inner side of the ventilation cabinet is formed with a sliding groove for the glass protective door to move vertically.

[0029] As a further improvement of this utility model: the top outer wall of the limiting block is inclined, a sealing gasket is provided on the outside of the handle of the tray that contacts the ventilation cabinet, and a limiting groove for the limiting block to be inserted is formed inside the ventilation cabinet.

[0030] Compared with the prior art, the beneficial effects of this utility model are:

[0031] By setting up a transmission mechanism, the glass protective door moves upward, and the thrust is transmitted to the U-shaped partition through the first and second gears. This aligns the groove of the U-shaped partition with the filter screen, which filters harmful gases. When the glass protective door is closed, the groove of the partition is misaligned with the filter screen, separating the filter screen from the inner cavity of the cabinet. When the filter screen is replaced, the dust that falls due to the vibration during replacement will be caught by the U-shaped partition, preventing contamination of the inner cavity of the ventilation cabinet and ensuring its cleanliness. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a cross-sectional view of the internal structure of the ventilation cabinet of this utility model;

[0034] Figure 3 This is a schematic diagram of the transmission rod installation structure of this utility model;

[0035] Figure 4 This is a cross-sectional view of the internal structure of the tray of this utility model.

[0036] In the diagram: 1. Ventilation cabinet; 2. Exhaust pipe; 3. Glass protective door; 4. Transmission mechanism; 401. Filter screen; 402. U-shaped partition; 403. First rack; 404. First gear; 405. Transmission rod; 406. Second gear; 407. Second rack; 408. Pressing block; 409. Connecting plate; 410. Limiting block; 411. Positioning rod; 412. Spring; 6. Tray. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Please see Figures 1-4 In this embodiment of the utility model, a laboratory ventilation device includes a ventilation cabinet 1, an exhaust pipe 2 installed at the top of the ventilation cabinet 1, a glass protective door 3 vertically slidably connected to the inner side of the ventilation cabinet 1, a tray 6 axially slidably installed inside the ventilation cabinet 1, and a transmission mechanism 4 set on the glass protective door 3 and the ventilation cabinet 1.

[0039] Transmission mechanism 4 includes a filtering unit, a separating unit, and a limiting unit;

[0040] The filtration unit is used to filter harmful gases generated during experiments inside the ventilation cabinet 1.

[0041] The partition unit is used to separate the exhaust pipe 2 from the inner cavity of the air exchanger 1;

[0042] The limiting unit is used to provide support and limit the installation of exhaust pipe 2;

[0043] The filtration unit includes a filter screen 401 and a U-shaped baffle 402;

[0044] The filter screen 401 is installed inside the ventilation cabinet 1 and located below the exhaust pipe 2. The filter screen 401 is used to filter harmful gases inside the ventilation cabinet 1.

[0045] The U-shaped partition 402 is axially slidably installed on the inner side of the ventilation cabinet 1. The U-shaped partition 402 is used to adjust the use and separation of the filter screen 401.

[0046] The separating unit includes a first rack 403, a first gear 404, a transmission rod 405, a second gear 406, and a second rack 407;

[0047] The first rack 403 is fixed to the top of the glass protective door 3. The first rack 403 is used to give the first gear 404 rotational thrust.

[0048] The first gear 404 is rotatably installed inside the air exchanger 1. The first gear 404 is used to synchronously drive one end of the transmission rod 405 to rotate circumferentially.

[0049] The transmission rod 405 is eccentrically rotatably connected to the outer wall of the first gear 404, and the transmission rod 405 is used to give the second gear 406 rotational thrust.

[0050] The second gear 406 is rotatably mounted on the inside of the air exchanger 1. The second gear 406 is used to provide the second rack 407 with axial moving thrust.

[0051] The second rack 407 is fixed to the outer wall of the U-shaped partition 402. The second rack 407 is used to synchronously drive the U-shaped partition 402 to move axially.

[0052] The limiting unit includes a pressing block 408, a connecting plate 409, a limiting block 410, a positioning rod 411, and a spring 412;

[0053] The pressing block 408 is vertically slidably installed on the outer wall of the top of the handle of the tray 6 and extends into the interior of the tray 6. The pressing block 408 is used to synchronously drive the connecting plate 409 to move vertically.

[0054] The connecting plate 409 is fixed to the bottom end of the pressing block 408 and located inside the tray 6. The connecting plate 409 is used to synchronously drive the limiting block 410 to move.

[0055] The limiting block 410 is fixed to the top outer wall of the connecting plate 409 and extends through the pallet 6 into the interior of the ventilation cabinet 1. The limiting block 410 is used to limit the axial movement of the pallet 6.

[0056] The positioning rod 411 is fixed inside the tray 6 and passes through the connecting plate 409. The positioning rod 411 is used to guide the vertical movement of the connecting plate 409.

[0057] The two ends of the spring 412 are respectively engaged inside the tray 6 and the bottom of the connecting plate 409. The spring 412 is used to always give the connecting plate 409 an upward compressive force.

[0058] In this embodiment: The glass protective door 3 is pushed upwards by activating the cylinder connected to its bottom, thus opening the glass protective door 3 and opening the inner cavity of the ventilation cabinet 1. The upward movement of the glass protective door 3 simultaneously drives the first rack 403 fixed at its top to move vertically. The vertically moving filter 401 provides a clockwise rotational thrust to the first gear 404 meshing with the outer wall. The clockwise rotation of the first gear 404 drives one end of the transmission rod 405 to rotate circumferentially, thereby simultaneously driving the second gear 406, which is eccentrically connected to the other end of the transmission rod 405, to rotate clockwise. The clockwise rotation of the second gear 406 provides an axial movement thrust to the second rack 407, thereby driving the U-shaped partition 402 fixed to the second rack 407 to move axially, causing the solid part of the U-shaped partition 402 to move axially until the glass protective door 3 is fully open. The hollow state of the U-shaped partition 402 will then align with the filter 401. At this point, the exhaust fan installed in the exhaust pipe 2 can be used to test the ventilation of the inner cavity of the ventilation cabinet 1. The harmful gases are discharged, passing through the U-shaped partition 402 and filtered by the filter screen 401. When the ventilation cabinet 1 is not in use, the cylinder is used again to close and reset the glass protective door 3, thereby moving the U-shaped partition 402 axially. This causes the solid position of the U-shaped partition 402 to move back below the filter screen 401, separating the filter screen 401 from the inner cavity of the ventilation cabinet 1. When the filter screen 401 needs to be replaced, it can be replaced by applying downward pressure to the pressing block 408. The connecting plate 409 moves synchronously, causing the moving 409 to simultaneously move the limiting block 410 out of the internal limiting groove of the air exchange cabinet 1, thereby pulling the tray 6 axially. This causes the tray 6 to move the inner filter screen 401 out, facilitating the quick replacement of the filter screen 401. During the replacement process, the dust falling due to the vibration of the filter screen 401 will be caught by the U-shaped partition 402 located below the filter screen 401, which will not affect the inner cavity of the air exchange cabinet 1, thus ensuring the cleanliness of the inner cavity of the air exchange cabinet 1.

[0059] Please refer to this carefully. Figures 1-4The two ends of the transmission rod 405 are eccentrically rotatably connected to the outer walls of the first gear 404 and the second gear 406, respectively. The two ends of the transmission rod 405 are equidistant from the midpoints of the first gear 404 and the second gear 406. The interior of the ventilation cabinet 1 is formed with a sliding groove for the axial movement of the U-shaped partition 402. The outer wall of the U-shaped partition 402 is in the shape of a "U". The solid part of the U-shaped partition 402 is matched with the filter screen 401. The end of the exhaust pipe 2 is equipped with a fan for exhausting harmful gases from inside the ventilation cabinet 1. The outer walls of rack 403 and rack 407 mesh with the outer walls of first gear 404 and second gear 406, respectively. A cylinder is installed inside the ventilation cabinet 1 to push the glass protective door 3 to move vertically. The output end of the cylinder is fixedly connected to the bottom of the glass protective door 3. A sliding groove for vertical movement of the glass protective door 3 is formed on the inner side of the ventilation cabinet 1. The top outer wall of the limiting block 410 is inclined. A sealing gasket is provided on the outer side of the handle of the tray 6 that contacts the ventilation cabinet 1. A limiting groove for the limiting block 410 to be inserted is formed inside the ventilation cabinet 1.

[0060] In this embodiment: This structure allows the first gear 404 and the second gear 406 to rotate in the same direction under the action of the transmission rod 405, thereby causing the U-shaped partition 402 to move axially away from the glass protective door 3 as it moves upward. The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A laboratory ventilation and air exchange device, comprising an air exchange cabinet (1), a gas exhaust pipe (2) is installed at the top end of the air exchange cabinet (1), a glass protective door (3) is vertically and slidingly connected to the inner side of the air exchange cabinet (1), and a tray (6) is axially and slidingly installed in the air exchange cabinet (1), characterized in that, Transmission mechanism (4) is arranged on glass protection door (3) and air exchange cabinet (1); The transmission mechanism (4) comprises a filtering unit, a separation unit and a limiting unit; The filtering unit is used for filtering harmful gas generated in the inner cavity of the air exchange cabinet (1); The separation unit is used for separating the air exhaust pipe (2) from the inner cavity of the air exchange cabinet (1); The limiting unit is used for supporting and limiting the installation of the air exhaust pipe (2).

2. A laboratory fume hood as defined in claim 1, wherein, The filtering unit comprises a filter screen (401) and a U-shaped partition plate (402); The filter screen (401) is installed inside the air exchange cabinet (1) and below the air exhaust pipe (2), and is used for filtering harmful gas in the air exchange cabinet (1); The U-shaped partition plate (402) is axially slidably installed on the inner side of the air exchange cabinet (1), and is used for adjusting the use and separation of the filter screen (401).

3. A laboratory fume hood as defined in claim 1, wherein, The separation unit comprises a first rack (403), a first gear (404), a transmission rod (405), a second gear (406) and a second rack (407); The first rack (403) is fixed to the top end of the glass protection door (3), and is used for giving the first gear (404) a rotating thrust; The first gear (404) is rotatably installed on the inner side of the air exchange cabinet (1), and is used for synchronously driving the one end of the transmission rod (405) to rotate circumferentially; The transmission rod (405) is eccentrically rotatably connected to the outer wall of the first gear (404), and is used for giving the second gear (406) a rotating thrust; The second gear (406) is rotatably installed on the inner side of the air exchange cabinet (1), and is used for giving the second rack (407) an axial movement thrust; The second rack (407) is fixed to the outer wall of the U-shaped partition plate (402), and is used for synchronously driving the U-shaped partition plate (402) to move axially.

4. A laboratory fume hood as defined in claim 2, wherein, The limiting unit comprises a pressing block (408), a connecting plate (409), a limiting block (410), a positioning rod (411) and a spring (412); The pressing block (408) is vertically slidably installed on the outer wall of the handle top end of the tray (6) and extends into the interior of the tray (6), and is used for synchronously driving the connecting plate (409) to move vertically; The connecting plate (409) is fixed to the bottom end of the pressing block (408) and located in the interior of the tray (6), and is used for synchronously driving the limiting block (410) to move; The limiting block (410) is fixed to the top end outer wall of the connecting plate (409) and extends through the tray (6) to the interior of the air exchange cabinet (1), and is used for limiting the axial movement of the tray (6); The positioning rod (411) is fixed in the interior of the tray (6) and penetrates through the connecting plate (409), and is used for guiding the vertical movement of the connecting plate (409); Two ends of the spring (412) are clamped in the interior of the tray (6) and the bottom end of the connecting plate (409) respectively, and the spring (412) is used for always giving the connecting plate (409) upward extrusion elastic force.

5. A laboratory fume hood as defined in claim 3, wherein, Both ends of the transmission rod (405) are eccentrically connected to the outer walls of the first gear (404) and the second gear (406), and the distances between both ends of the transmission rod (405) and the midpoints of the first gear (404) and the second gear (406) are the same.

6. A laboratory fume hood as defined in claim 2, wherein, The inside of the air exchange cabinet (1) is formed with a sliding groove for the axial movement of the U-shaped partition plate (402), the outer wall of the U-shaped partition plate (402) is in the overall "U" shape structure, and the solid part of the U-shaped partition plate (402) is matched with the whole filter screen (401).

7. A laboratory fume hood as defined in claim 3, wherein, The end of the exhaust pipe (2) is provided with a fan for discharging harmful gases in the air exchange cabinet (1), and the outer walls of the first rack (403) and the second rack (407) are respectively engaged with the outer walls of the first gear (404) and the second gear (406).

8. A laboratory fume hood as defined in claim 1, wherein, The inside of the air exchange cabinet (1) is provided with a cylinder for pushing the glass protection door (3) to move vertically, the output end of the cylinder is fixedly connected with the bottom of the glass protection door (3), and the inside of the air exchange cabinet (1) is formed with a sliding groove for the vertical movement of the glass protection door (3).

9. A laboratory fume hood as defined in claim 4, wherein, The top outer wall of the limiting block (410) is in an inclined state, the handle position of the tray (6) is provided with a sealing gasket outside the contact with the air exchange cabinet (1), and the inside of the air exchange cabinet (1) is formed with a limiting groove for the insertion of the limiting block (410).

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